Finding the Fourth Proportional to 1,913.69, 2,870.76 and 1,420.70

Step by Step Solution

1. Step 1: Write the proportion equation
   1,913.69 : 2,870.76 = 1,420.70 : x
2. Step 2: Convert to fraction form
   1,913.69/2,870.76 = 1,420.70/x
3. Step 3: Cross multiply
   1,913.69x = 2,870.76 × 1,420.70
4. Step 4: Simplify right side
   1,913.69x = 4,078,495.91
5. Step 5: Solve for x
   x = 4,078,495.91/1,913.69
6. Step 6: Final answer
   x = 2,131.23